As mentioned on the OSM wiki for the railway=miniature tag:
Miniature railways are found in parks, public/private gardens and can be tourist attractions in their own right.
So it would be nice to show them on the map.
Currently, it's quite confusing when miniature railway stations are shown with no actual railway attached.
Describe the ideal solution
I would like to see miniature railway tracks shown on the map, similarly to how the OSM website does.
Describe alternatives you have considered
The OSM website shows them as a ticked line, e.g. the Watford Miniature Railway.
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